The invention relates to a method for processing metal powder comprising a plurality of small metal powder balls. Said method includes the following steps: - heating the small metal powder balls until the same reach a liquid state; - causing a collision between the liquid small metal powder balls and a heated impact member, the temperature of which exceeds the melting point of the small metal powder balls, in order to form small metal powder balls having reduced diameters; - cooling the small metal powder balls that were formed during the collision and have reduced diameters; and - collecting the cooled small metal powder balls having reduced diameters in a receptacle.